1 Explain that a population pyramid shows the age and sex structure of a population. 2  Point to the horizontal bars, which show the percentage (or the absolute number) of males and females in each age group. 3  Have students interpret the chart.
1 Although they range from $150-$400 or more, a large capacity (25-70 pints) dehumidifier for a basement (the dampest portion of most homes) or other large area averages $200-$300.
However, you should check first to see if there are any restrictions on using greywater in your area. While the benefits of dehumidifier ownership are many, there are some potential downsides, too. For one thing, cost may be an issue. Dehumidifiers can be somewhat pricey -- many models sell for more than $150. Or you may just object to having a bucket of standing water sitting around in your home. No matter what your reservations are, it's worth figuring out if you really need a dehumidifier before you take the plunge and buy one.